Techniques of optical scanning microscopy

Wilson, Tony

doi:10.1088/0022-3735/22/8/001

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…Without the complete details about how the various membrane modules “existed” over their entire life it is impossible to state with complete certainty what caused the samples to become compromised and thus reach the level of severe degradation that was observed. During manufacturing, high temperature extrusion could cause initial thermal degradation mostly at the fiber surface boundaries . Trace amount of metal catalyst residue or additive of hydroperoxide to control the molecular mass during manufacturing could also accelerate oxidation .…”

Section: Resultsmentioning

confidence: 99%

Forensic analysis of degraded polypropylene hollow fibers utilized in microfiltration

Lu¹,

Shah

Maruf³

et al. 2014

J of Applied Polymer Sci

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Numerous polypropylene hollow fiber microfiltration membrane modules were severely degraded after utilization as pretreatment in a military water purification system. To determine the plausible causes of degradation, thermal, chemical, and mechanical material properties were initially evaluated by using differential scanning calorimetry, thermogravimetric analysis, 13C solid‐state nuclear magnetic resonance, attenuated total reflectance infrared spectroscopy, and a tensile strength material testing system. The evaluation implied oxidation during the usage or storage of the samples. Protocols using more specialized techniques, micro‐Raman spectroscopy along with energy dispersive X‐ray spectroscopy and an atomic force microscope‐based nano‐thermal analysis, were developed to examine the chemical and thermal properties along the cross‐section of the samples at the micron and submicron‐scale. These results indicated that the degradation mainly took place at the outer and inner boundaries of the samples. Pristine samples exposed to several plausibly harsh environments did not evidence the same level of mechanical failure, but a few circumstances had similar test responses, leading to a hypothesis of high oxidative stress as the main failure etiology versus a slowly evolving one. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41553.

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Section: Resultsmentioning

confidence: 99%

Forensic analysis of degraded polypropylene hollow fibers utilized in microfiltration

Lu¹,

Shah

Maruf³

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Confocal optical beam induced current microscopy of light-emitting diodes with a white-light supercontinuum source

2007

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Photocurrent mapping of near-field optical antenna resonances

2011

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An increasing number of photonics applications make use of nanoscale optical antennas that exhibit a strong, resonant interaction with photons of a specific frequency. The resonant properties of such antennas are conventionally characterized by far-field light-scattering techniques. However, many applications require quantitative knowledge of the near-field behaviour, and existing local field measurement techniques provide only relative, rather than absolute, data. Here, we demonstrate a photodetector platform that uses a silicon-on-insulator substrate to spectrally and spatially map the absolute values of enhanced fields near any type of optical antenna by transducing local electric fields into photocurrent. We are able to quantify the resonant optical and materials properties of nanoscale (∼50 nm) and wavelength-scale (∼1 µm) metallic antennas as well as high-refractive-index semiconductor antennas. The data agree well with light-scattering measurements, full-field simulations and intuitive resonator models.

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Techniques of optical scanning microscopy

Cited by 4 publications

References 29 publications

Forensic analysis of degraded polypropylene hollow fibers utilized in microfiltration

Forensic analysis of degraded polypropylene hollow fibers utilized in microfiltration

Confocal optical beam induced current microscopy of light-emitting diodes with a white-light supercontinuum source

Photocurrent mapping of near-field optical antenna resonances

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